Roasted Garlic Soup without shells

1 head cauliflower 1 large head of garlic 1/2 tablespoon olive oil 1 tablespoon butter 1 1/2 stalks celery , diced 1 yellow onion , diced 1 carrot , diced 1/2[...]

4 cups Swanson chicken broth 6 medium red potatoes, cut into cubes (about 4 cups) 2 medium carrots , diced 1 medium white onion, chopped (about 1/2 cup) 3[...]